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Journal of Enhanced Heat Transfer
IF: 1.406 5-Year IF: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2020033635
pages 389-405


Yan Chen
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Xu Feng
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Xinyu Wang
Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Gongming Xin
School of Energy and Power Engineering, Shandong University, Jinan 250061, China


The heat transfer characteristics of gravity heat pipes (GHPs) with internal helical microfins (IHMs) were investigated experimentally, in comparison with smooth GHPs. The influence of different IHM arrangements on the GHPs was obtained. Four types of GHPs were designed and fabricated: GH-PIHM1 (GHP with IHM arranged only in the condenser section); GHPIHM2 (GHP with IHM arranged in both the condenser and adiabatic sections); GHPIHM3 (GHP with IHM arranged in all inner surfaces); and GHP (smooth GHP). The results showed that applying IHMs on the inner surface enhances the performance of the GHP; typically, by lowering the operating temperature and thermal resistance. All of the GHPs with IHMs demonstrated lower working temperatures than the smooth GHP; in particular, GHPIHM2 and GHPIHM3 decreased the working temperature by 23°C at 240 W. For most of the tested cases, the thermal resistance of GHPs with IHMs was reduced, as presented in ascending order: GHPIHM3 < GHPIHM2 < GHPIHM1 < GHP. For the condensation heat transfer coefficient, all three GHPs with IHMs can be improved; for the evaporation heat transfer coefficient, GHPIHM1 became worse while GHPIHM2 and GHPIHM3 performed better.


  1. Alammar, A.A., Al-Mousawi, F.N., Al-Dadah, R.K., Mahmoud, S.M., and Hood, R., Enhancing Thermal Performance of a Two-Phase Closed Thermosyphon with an Internal Surface Roughness, J. Cleaner Prod., vol. 185, pp. 128-136,2018.

  2. Aly, W.I., Elbalshouny, M.A., El-Hameed, H.A., and Fatouh, M., Thermal Performance Evaluation of a Helically-Micro-Grooved Heat Pipe Working with Water and Aqueous Al2O3 Nanofluid at Different Inclination Angle and Filling Ratio, Appl. Therm. Eng., vol. 110, pp. 1294-1304,2017.

  3. Chen, Y.Z., Zhou, Y.H., and Ding, X.W., An Investigation of the Heat-Transfer Fluctuation Characteristics in Gravity Heat Pipes and an Exploration of Methods for Their Restraint, Therm. Power Eng., vol. 18, no. 4, pp. 334-337,2003.

  4. De Kerpel, K., De Schampheleire, S., Steuperaert, H., De Jaeger, P., and De Paepe, M., Experimental Study of the Effect of Felt Wick Porosity on Capillary-Driven Heat Pipes, Appl. Therm. Eng., vol. 96, pp. 690-698,2016.

  5. Di Francescantonio, N., Savino, R., and Abe, Y., New Alcohol Solutions for Heat Pipes: Marangoni Effect and Heat Transfer Enhancement, Int. J. Heat Mass Transf, vol. 51, nos. 25-26, pp. 6199-6207,2008.

  6. Emani, M.S., Nayak, A., Chowdhuri, A.K., Mandal, B.K., and Saha, S.K., Experimental Investigation on Heat Transfer Augmentation in Horizontal Tube Using Coiled Wire Inserts, J. Enhanced Heat Transf., vol. 26, no. 5, pp. 513-534,2019.

  7. Faghri, A., Review and Advances in Heat Pipe Science and Technology, J. Heat Transf., vol. 134, no. 12, ID. 123001,2012.

  8. Faghri, A., Heat Pipes: Review, Opportunities and Challenges, Front. Heat Pipes, vol. 5, no. 1, pp. 1-48, 2014.

  9. Fleming, A.J., Thomas, S.K., and Yerkes, K.L., Titanium-Water Loop Heat Pipe Operating Characteristics under Standard and Elevated Acceleration Fields, J. Thermophys. Heat Transf., vol. 24, no. 1, pp. 184-198,2010.

  10. Gao, M., Cao, Y., Beam, J.E., and Donovan, B., Structural Optimization of Axially Grooved Flat Miniature Heat Pipes, J. Enhanced Heat Transf., vol. 7, no. 6, pp. 361-369,2000.

  11. Gedik, E., Yilmaz, M., and Kurt, H., Experimental Investigation on the Thermal Performance of Heat Recovery System with Gravity Assisted Heat Pipe Charged with R134a and R410A, Appl. Therm. Eng., vol. 99, pp. 334-342,2016.

  12. Ghanbarpour, M., Nikkam, N., Khodabandeh, R., and Toprak, M.S., Thermal Performance of Inclined Screen Mesh Heat Pipes Using Silver Nanofluids, Int. Commun. Heat Mass Transf., vol. 67, pp. 14-20, 2015.

  13. Heris, S.Z., Fallahi, M., Shanbedi, M., and Amiri, A., Heat Transfer Performance of Two-Phase Closed Thermosyphon with Oxidized CNT/Water Nanofluids, Heat Mass Transf., vol. 52, no. 1, pp. 85-93, 2016.

  14. Hu, Y., Huang, K., and Huang, J., A Review of Boiling Heat Transfer and Heat Pipes Behaviour with Self-Rewetting Fluids, Int. J. Heat Mass Transf., vol. 121, pp. 107-118,2018.

  15. Huang, C., Lin, W.K., and Wang, S.R., Analysis of the Impact of U-Shaped Structure for Heads of Loop Thermosyphon Solar Water Heater on Thermal Storage Efficiency, J. Enhanced Heat Transf., vol. 23, no. 3, pp. 175-195,2016.

  16. Jafari, D., Franco, A., Filippeschi, S., and Marco, P.D., Two-Phase Closed Thermosyphons: A Review of Studies and Solar Applications, Renewable Sustainable Energy Rev., vol. 53, pp. 575-593,2016.

  17. Kabov, O.A. and Chinnov, E.A., Vapor-Gas Mixture Condensation in a Two-Chamber Vertical Ther-mosyphon, J. Enhanced Heat Transf., vol. 9, no. 2, pp. 57-67,2002.

  18. Khazaee, I., Hosseini, R., Kianifar, A., andNoie, S.H., Experimental Consideration and Correlation of Heat Transfer of a Two-Phase Closed Thermosyphon due to the Inclination Angle, Filling Ratio, and Aspect Ratio, J. Enhanced Heat Transf., vol. 18, no. 1,pp. 31-40,2011.

  19. Kuang, Y., Yi, C., and Wang, W., Heat Transfer Performance Analysis of a Large-Scale Separate Heat Pipe with a Built-In Tube, Appl. Therm. Eng., vol. 167, p. 114716,2020.

  20. Kumaresan, G., Venkatachalapathy, S., and Asirvatham, L.G., Experimental Investigation on Enhancement in Thermal Characteristics of Sintered Wick Heat Pipe Using CuO Nanofluids, Int. J. Heat Mass Transf., vol. 72, pp. 507-516,2014.

  21. Kuzma-Kichta, Y.A. and Leontiev, A.I., Choice and Justification of the Heat Transfer Intensification Methods, J. Enhanced Heat Transf., vol. 25, no. 6, pp. 465-564,2018.

  22. Lataoui, Z. and Jemni, A., Experimental Investigation of a Stainless Steel Two-Phase Closed Ther- mosyphon, Appl. Therm. Eng., vol. 121, pp. 721-727,2017.

  23. Liu, H.Y., Two-Dimensional Circular Gravity Heat Pipe, CN Patent ZL200710000056, filed January 8, 2007, issued July 11,2007.

  24. Liu, J., Lu, S., Chen, Q., Zhang, J.H., and Yao, S.G., Stability of Nanofluids for Heat Pipe, Mater. Sci. Forum, vol. 789, pp. 6-11,2014.

  25. Louahlia-Gualous, H., Le Masson, S., and Chahed, A., An Experimental Study of Evaporation and Conden-sation Heat Transfer Coefficients for Looped Thermosyphon, Appl. Therm. Eng., vol. 110, pp. 931-940, 2017.

  26. Mehrali, M., Sadeghinezhad, E., Azizian, R., Akhiani, A.R., Latibari, S.T., and Metselaar, H.S.C., Effect of Nitrogen-Doped Graphene Nanofluid on the Thermal Performance of the Grooved Copper Heat Pipe, Energy Convers. Manage., vol. 118, pp. 459-473,2016.

  27. Naresh, Y. and Balaji, C., Experimental Investigations of Heat Transfer from an Internally Finned Two Phase Closed Thermosiphon, Appl. Therm. Eng., vol. 112, pp. 1658-1666,2017.

  28. Qu, J., Wu, H., and Cheng, P., Recent Advances in MEMS-Based Micro Heat Pipes, Int. J. Heat Mass Transf., vol. 110, pp. 294-313,2017.

  29. Ramezanizadeh, M., Nazari, M.A., Ahmadi, M.H., and Acikkalp, E., Application of Nanofluids in Thermosyphons: A Review, J. Mol. Liq., vol. 272, pp. 395-402,2018.

  30. Salehi, H., Heris, S.Z., and Noie, S.H., Experimental Study of a Two-Phase Closed Thermosyphon with Nanofluid and Magnetic Field Effect, J. Enhanced Heat Transf., vol. 18, no. 3, pp. 261-269,2011.

  31. Sarafraz, M.M., Hormozi, F., and Peyghambarzadeh, S.M., Role of Nanofluid Fouling on Thermal Performance of a Thermosyphon: Are Nanofluids Reliable Working Fluid?, Appl. Therm. Eng., vol. 82, pp. 212-224,2015.

  32. Savino, R., De Cristofaro, D., and Cecere, A., Flow Visualization and Analysis of Self-Rewetting Fluids in a Model Heat Pipe, Int. J. Heat Mass Transf., vol. 115, pp. 581-591,2017.

  33. Savino, R., Piccolo, C., Fortezza, R., and Abe, Y., Heat Pipes with Self-Rewetting Fluids under Low-Gravity Conditions, Microgravity Sci. Technol., vol. 19, nos. 3-4, pp. 75-77,2007.

  34. Sozen, A., Menlik, T., Guru, M., Boran, K., Kilic, F., Aktas, M., and Cakir, M.T., A Comparative Investigation on the Effect of Fly-Ash and Alumina Nanofluids on the Thermal Performance of Two-Phase Closed Thermo-Syphon Heat Pipes, Appl. Therm. Eng., vol. 96, pp. 330-337,2016.

  35. Tian, E., He, Y.L., and Tao, W.Q., Research on a New Type Waste Heat Recovery Gravity Heat Pipe Exchanger, Appl. Energy, vol. 188, pp. 586-594,2017.

  36. Wang, X.Y., Xin, G.M., and Tian, F.Z., Effect of Internal Helical Microfin on Condensation Performance of Two-Phase Closed Thermosyphon, Adv. Mater. Res., vol. 516, pp. 9-14,2012.

  37. Xin, G.M., Wang, X.Y, and Zhang, L.S., Operating Characteristics of Gravity Heat Pipe with Internal Helical Microfin under Variable Power, J. Eng. Thermophys., vol. 34, no. 11, pp. 2116-2119,2013.

  38. Yang, J.H., Li, Q., Lu, W.Q., Li, Z.Y., Li, Q., and Zhou, Y., Experimental Study of the Dynamic Heat Transfer Performance of a Coaxial Thermosyphon, J. Enhanced Heat Transf., vol. 12, no. 4, pp. 315-325,2005.

  39. Yong, C.P., Wang, Z.F., and Zhang, C., Thermal Characteristics of Heat Pipe with Axially Swallow-Tailed Microgrooves, Chin. J. Chem. Eng., vol. 18, no. 2, pp. 185-193,2010.

  40. Zhao, Z., Jiang, P., Zhou, Y., Zhang, Y., and Zhang, Y., Heat Transfer Characteristics of Two-Phase Closed Thermosyphons Modified with Inner Surfaces of Various Wet Abilities, Int. Commun. Heat Mass Transf., vol. 103, pp. 100-109,2019.

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